- (id)initWithFrame:(NSRect)frame {
    self = [super initWithFrame:frame];
      if (self) {
       CGFloat xInset = 3.0f * (NSWidth(frame) / 8.0f);
       CGFloat yInset = 3.0f * (NSHeight(frame) / 8.0f);
       NSRect moverFrame = NSInsetRect(frame, xInset, yInset);
       moverFrame.origin.x = NSMidX([self bounds]) -(NSWidth(moverFrame) / 2.0f);
       moverFrame.origin.y = NSMidY([self bounds]) -(NSHeight(moverFrame) / 2.0f);
mover = [[NSImageView alloc] initWithFrame:moverFrame];
[mover setImageScaling:NSScaleToFit];
[mover setImage:[NSImage imageNamed:@"photo.jpg" ]];
 NSDictionary *animations =[NSDictionary dictionaryWithObjectsAndKeys:
       [self groupAnimation:moverFrame], @"frameRotation" , nil];
       [mover setAnimations:animations];
       [self addSubview:mover];
  }
        return self;
}
  

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    - (CAAnimation *)frameAnimation:(NSRect)aniFrame {
        CAKeyframeAnimation *frameAnimation =[CAKeyframeAnimation animationWithKeyPath:@"frame" ];

NSRect start = aniFrame;
NSRect end = NSInsetRect(aniFrame, -NSWidth(start) * 0.50,-NSHeight(start) * 0.50);

frameAnimation.values = [NSArray arrayWithObjects:[NSValue valueWithRect:start],[NSValue valueWithRect:end], nil];

return frameAnimation;
}

- (CABasicAnimation *)rotationAnimation {
    CABasicAnimation *rotation =[CABasicAnimation animationWithKeyPath:@"frameRotation" ];
    rotation.fromValue = [NSNumber numberWithFloat:0.0f];
    rotation.toValue = [NSNumber numberWithFloat:45.0f];
    return rotation;
}

- (CAAnimationGroup *)groupAnimation:(NSRect)frame {
 CAAnimationGroup *group = [CAAnimationGroup animation];

group.animations = [NSArray arrayWithObjects:[self frameAnimation:frame],[self rotationAnimation], nil];

group.duration = 1.0f;
group.autoreverses = YES;
return group;
 
}
  

    - (BOOL)acceptsFirstResponder {
       return YES;
}
- (void)keyDown:(NSEvent *)event {
       [[mover animator] setFrameRotation:[mover frameRotation]];
}
  

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Animation Types----Grouping Animations